void gradient()
{
	Double_t r[5] = {1,1,0,0,0};
	Double_t g[5] = {0,1,1,1,0};
	Double_t b[5] = {0,0,0,1,1};
	Double_t stop[5] = {0,.25,.5,.75,1};
	TColor::CreateGradientColorTable(5,stop,r,g,b,20);
}
